perf(document): avoid running validation on every array element if th…

…ere's no validators to run

Re: #11380

lib/document.js

@@ -2517,6 +2517,16 @@ function _getPathsToValidate(doc) {
       continue;
     }
 
+    // gh-11380: optimization. If the array isn't a document array and there's no validators
+    // on the array type, there's no need to run validation on the individual array elements.
+    if (_pathType &&
+        _pathType.$isMongooseArray &&
+        !_pathType.$isMongooseDocumentArray && // Skip document arrays...
+        !_pathType.$embeddedSchemaType.$isMongooseArray && // and arrays of arrays
+        _pathType.$embeddedSchemaType.validators.length === 0) {
+      continue;
+    }
+
     const val = doc.$__getValue(path);
     _pushNestedArrayPaths(val, paths, path);
   }